Publication

Coherent oscillations between polariton vortex and anti-vortex states in an elliptical resonator

Benoît Marie Joseph Deveaud, François Morier-Genoud
2011
Conference Papers

Abstract

In this experimental work, we optically excite the eigenmodes of an elliptical resonator in a semiconductor micro-cavity. Using a pulsed excitation, we create a superposition of eigenmodes, and image the time evolution of the coherent emission pattern. Oscillations between vortex and anti-vortex states are observed, and remarkably well described within the Poincar sphere representation for an eigenmode containing an orbital angular momentum. A semiconductor quantum well is embedded in the microcavity structure. The system is operated in the strong light matter coupling regime, where the eigenmodes are hybrid half-photonic half-excitonic quasiparticles called exciton polaritons.

Official source

https://infoscience.epfl.ch/entities/publication/efcd4e17-1566-4c66-a3f1-96ac8075a846

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Benoît Marie Joseph Deveaud, François Morier-Genoud
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/efcd4e17-1566-4c66-a3f1-96ac8075a846

About this result

Related concepts (32)

Coherent state

In physics, specifically in quantum mechanics, a coherent state is the specific quantum state of the quantum harmonic oscillator, often described as a state which has dynamics most closely resembling the oscillatory behavior of a classical harmonic oscillator. It was the first example of quantum dynamics when Erwin Schrödinger derived it in 1926, while searching for solutions of the Schrödinger equation that satisfy the correspondence principle.

Quantum vortex

In physics, a quantum vortex represents a quantized flux circulation of some physical quantity. In most cases, quantum vortices are a type of topological defect exhibited in superfluids and superconductors. The existence of quantum vortices was first predicted by Lars Onsager in 1949 in connection with superfluid helium. Onsager reasoned that quantisation of vorticity is a direct consequence of the existence of a superfluid order parameter as a spatially continuous wavefunction.

Orbital angular momentum of light

The orbital angular momentum of light (OAM) is the component of angular momentum of a light beam that is dependent on the field spatial distribution, and not on the polarization. It can be further split into an internal and an external OAM. The internal OAM is an origin-independent angular momentum of a light beam that can be associated with a helical or twisted wavefront. The external OAM is the origin-dependent angular momentum that can be obtained as cross product of the light beam position (center of the beam) and its total linear momentum.

Related publications (1)

Coherent oscillations between polariton vortex and anti-vortex states in an elliptical resonator

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Coupled Photonic-Crystal Cavities and Quantum-Wire Microlasers